(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

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Graphical Selection for Infix Command Syntax

Publishing Venue

IBM

Abstract

The following article is a discussion of a software algorithm by which a user can choose, by gesturing, an object from among a set of multiple possible objects as a target for an infix command. This idea consists of the graphical algorithm used to allow a user to select one from a number of objects by moving the pointing device in any haphazardly-traced, sort-of-circular path.

Country

Undisclosed

Language

English (United States)

This text was extracted from a PDF file.

This is the abbreviated version, containing approximately
80% of the total text.

As an example, suppose we have a graphical programming language with functions

represented by icons and data paths represented by directed lines connecting the icons. User selects one icon, the source, and issues a menu action "Make Parallel"

. However, not all icons on the screen may be valid targets of the action . On button-down the system computes all possible targets and designates one of them as current target .

which will create a parallel processing connection to some other icon

user gestures with the pointing device, tracing a wobbly path round the screen the system designates each of the other possible targets in turn until on button -up the system uses the currently designated target.

The algorithm

Suppose there are N objects from which to choose .

, consider a circle of arbitrary radius with fixed center C in the middle of the screen . Divide the circle into N pie-slices, each with angular width 360/N degrees, each slice representing one of the possible N choices. Now for any arbitrary mouse or pointer position P (except P = C, of course) the line segment from C to P will pass through exactly one of the pie-slices.